body {
    margin: 20px 10px 20px 40px;
}
.clear {
    clear: both;
}

.left {
    width: 900px;
    height: 100%;
    border: 1px solid gray;
    float: left;
    position: relative;
}
.playground {
    /*border: 1px solid black;*/
    background-color: #000000;
}
.measureGrids {
    position: absolute;
    width: 880px;
    height: 720px;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    font-size: 8px;
    display: none;
}
.measureGrids > div {
    height: 20px;
    position: relative;
}
.measureGrids > div:last-child {
    position: absolute;
    top: -20px;
}
.measureGrids > div > span {
    width: 19px;
    height: 19px;
    display: inline-block;
    border-right: 1px solid green;
    border-bottom: 1px solid green;
}
.measureGrids > div > span:last-child {
    position: absolute;
    left: -20px;
}
.right {
    width: 180px;
    height: 100%;
    border: 1px solid gray;
    border-left: none;
    float: left;
    text-align: center;
    padding: 10px 0;
}
.right button {
    display: inline-block;
    width: 100px;
    height: 25px;
    line-height: 25px;
    margin: 5px 0;
}